9 Actors Who Prepared For Movie Roles In The Worst Possible Way

9. James McAvoy Shaves His Head - X-Men: First Class

James McAvoy was understandably over the moon when he first got wind of the fact he would be playing a young Charles Xavier in Matthew Vaughn's X-Men: First Class. Lining up alongside the likes of Michael Fassbender and Jennifer Lawrence, the star would take his place as one of the core members of the prequel era of X-Men as the films explored the early beginnings of the relationships forged between Professor X, Magneto, Raven/Mystique and many more.

However, his over-exuberance upon signing on the dotted line ultimately led to him deciding to part ways with his luscious locks before shooting, in an attempt to give himself that signature Xavier dome look. McAvoy quickly found out during his first day of shooting on the film, however, a month on from shaving his head, that this was definitely not the look they were going for.

Instead, Vaughn and co. wanted Xavier to be sporting a mane for this particular flick, so the actor was required to wear hair extensions throughout the shoot. He'd finally get the chance to go full-Xavier in X-Men: Apocalypse, though, keeping the lack-of-hairstyle for Dark Phoenix too.